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Heating method of weather-proof sheet billet

A heating method and steel slab technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve problems affecting the mechanical properties of products, unsatisfactory effects, and damage to main rolling line equipment, and achieve significant economic and social benefits. Improve the qualified rate of furnace descaling and improve the quality of surface material

Inactive Publication Date: 2010-06-23
PANGANG GRP PANZHIHUA STEEL & VANADIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the furnace scale on the surface of the slab cannot be completely removed before rolling the weathering steel slab, the scale may be pressed into the surface of the strip during the rolling process, which will cause physical quality defects on the surface of the coil, which will seriously affect Product mechanical properties
In addition, the slab that has not been descaled will deteriorate the rolling state during the rolling process, and even produce scrap steel or damage the main rolling line equipment
[0004] Therefore, in order to improve the qualified rate of descaling, a reducing atmosphere is usually used in the heating furnace to control the amount of oxide scale generated in special steel such as weathering steel, but the effect is often not ideal

Method used

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Examples

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Effect test

Embodiment 1

[0044] A total of 782 weather-resistant steel slabs with a size of 200mm×1250mm×L are heated by the technology of the present invention. The average temperature of the slabs is 1215°C, which is 11°C lower than that of the existing technology; the average temperature of the heating section is 1271°C, which is higher than that of the existing technology. The technology is 12°C lower than the technology, and the average temperature of the soaking section is 1244°C, which is 9°C lower than that of the existing technology. The heating time of the slab at different furnace temperatures is only 1-2 minutes longer than the specified time, which is significantly shorter than that of the existing technology; The average temperature of slabs in the first heating furnace is 1211°C, and the average temperature of slabs in the second heating furnace is 1217°C. The temperature of slabs in the second heating furnace is 6 times higher than that in the first heating furnace. °C, which is 4.8 °C ...

Embodiment 2

[0053] Using the technology of the present invention to heat 100 weather-resistant steel slabs with a section of 200mm×1200mm, the average temperature of the slabs is 1237°C, and the average temperatures of the preheating section, heating section and preheating section of the heating furnace are respectively 1087°C and 1280°C and 1273°C, wherein the average air-to-coal ratio of the upper section of the heating section of the heating furnace is 2.15, and the average air-to-coal ratio of the lower section of the heating section is 2.02. According to statistics, the qualified rate of descaling of these 100 pieces of furnace scale is as high as 96.4%.

Embodiment 3

[0055] Using the technology of the present invention to heat 100 weather-resistant steel slabs with a section of 200mm×920mm, the average temperature of the slabs is 1205°C, and the average temperatures of the preheating section, heating section and preheating section of the heating furnace are respectively 1087°C and 1252°C and 1233°C, wherein the average air-to-coal ratio of the upper section of the heating section of the heating furnace is 2.05, and the average air-to-coal ratio of the lower section of the heating section is 1.98. According to statistics, the qualified rate of descaling of these 100 pieces of furnace scale is as high as 95.8%.

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Abstract

The invention discloses a heating method of a weather-proof sheet billet. According to the heating method of the invention, sheet billets with different cross sections adopt different heating time according to charging temperature, and the heated sheet billet enters a descaling box to descale. The heating method of a weather-proof sheet billet comprises steps of controlling the air-coal ratio of the upper section of the heating section of a heating furnace to 2.05-2.15, and controlling the air-coal ratio of the lower section of the heating section to 1.95-2.05 so as to ensure that the heating section of the heating furnace to be under the oxidizing atmosphere. Thus, the invention reduces the generation amount of sheet billet furnace scale by the optimization of the heating system of the weather-proof sheet billet, discharging rhythm control, heat preservation system and air-coal ratio, avoids sheet billet scale solidification and does not affect subsequent rolling technology.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a heating method for a weathering steel slab. Background technique [0002] At present, the walking beam heating furnace is mainly used to heat general carbon structural steel, high-quality carbon structural steel, low carbon steel and low alloy steel for cold rolling and other steel types. Weathering steel is a low-alloy steel resistant to atmospheric corrosion. It is mainly used to manufacture steel structures such as vehicles, containers, bridge towers, etc. Its grades mainly include Q450NQR1, Q400NQR1, Q550NQR1, Q700NQR1, etc. In order to increase the output of weathering steel, generally large-scale rolling mills are equipped with multiple parallel or oppositely arranged heating furnaces. The low-temperature slab is heated in the heating furnace. After the slab meets the heating quality requirements, it is released from the furnace, and is transported to the descaling bo...

Claims

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Application Information

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IPC IPC(8): C21D9/46C21D1/34
Inventor 曹枫洲罗宝军杨安林朱乐王巍邓超
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM
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